I don't think it's too far fetched that he'd become a chemistry teacher. For one, he was probably burned out after his falling out with Grey Matter. Teaching jobs can also be very appealing for people interested in living a simple family life. The pay isn't great, but your family gets health insurance, you have very good job security, and your retirement is taken care of with your pension. Additionally, teachers that are parentd have hours and vacation times that match up perfectly with the schedules of their kids. Walt probably had higher paying jobs at chemical factories when he was younger, but at a certain point the perks of being a teacher were probably more appealing to Walt-the-family -man than the higher pay.

I know I'm a little late to the party, but I agree with you. This theory also fits in with Quaithe's prophecy that Dany will have to go east to go west and pass under the shadow. A lot of people think this means Dany has to go to Asshai but Vaes Dothrak is fairly far east (it's east of Mereen) and in AGOT Dany notes that Vaes Dothrak sits under the shadow of the mother of mountains.